<?php
/**
 * 预排序遍历分类树
 */

class TreePreOrderHelper
{
	public static function getList($parent_id = 0)
	{
	
	}
	
	public static function insert($parent_id = 0)
	{
		
	}
	
	public static function update()
	{
		
	}
	
	public static function remove()
	{
		
	}
}

